The function is .
Substitute the value of in the above original function.
Apply the square of a sum of two numbers formula : .
.
The option C is correct answer.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=fdf1ef69ec52f9be8cda4e7fdf351fb7.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c74618c1d2ed5c62ff14344c0d39d5e2.png\")
in the above original function.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a6e93c271ab0872601dd6689c2042dff.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6f7ef9bfdf6e34bf601be6c260c61ae2.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=eda9122c75200d01d476bd118673b195.png\")
.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")